Suspended particles in a system made up of Aldrich humic acids (HAs) in water account for about 13% of the total HA mass, 10–11% of the organic carbon and 9–11% of radiation extinction in the UVA region. Extinction would be made up of radiation scattering (less than one third) and absorption (over two thirds). The contribution of particles to the degradation rates of trimethylphenol and furfuryl alcohol (FFA) (probes of triplet states and 1O2, respectively) was lower than 10% and possibly negligible. The results indicate that triplet states and 1O2 occurring in the solution bulk are mostly produced by the dissolved HA fraction. Experimental data would not exclude production of 1O2 in particle hydrophobic cores, unavailable for reaction with FFA. However, the limited to negligible particle fluorescence places an upper limit to particle core photoactivity.

Transformation of 2,4,6-trimethylphenol and furfuryl alcohol, photosensitised by Aldrich humic acids subject to different filtration procedures

MINELLA, Marco;MAURINO, Valter;MINERO, Claudio;VIONE, Davide Vittorio
2013

Abstract

Suspended particles in a system made up of Aldrich humic acids (HAs) in water account for about 13% of the total HA mass, 10–11% of the organic carbon and 9–11% of radiation extinction in the UVA region. Extinction would be made up of radiation scattering (less than one third) and absorption (over two thirds). The contribution of particles to the degradation rates of trimethylphenol and furfuryl alcohol (FFA) (probes of triplet states and 1O2, respectively) was lower than 10% and possibly negligible. The results indicate that triplet states and 1O2 occurring in the solution bulk are mostly produced by the dissolved HA fraction. Experimental data would not exclude production of 1O2 in particle hydrophobic cores, unavailable for reaction with FFA. However, the limited to negligible particle fluorescence places an upper limit to particle core photoactivity.
90
306
311
Photosensitisers; Humic acid triplet states; Singlet oxygen; Spectral slope; Radiation absorption
Marco Minella; Maria Paola Merlo; Valter Maurino; Claudio Minero; Davide Vione
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/141258
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